MINERALS OF THE NEW RED SANDSTONE AND TRAP. 115 



varieties, which have been named Acadiolite, are found abun- 

 dantly at Two Islands in trap conglomerate. Their i-ed 

 colour is due to the peroxide of iron which abounds in the 

 cement of the conglomerate and the neighbouring red sandstone. 

 Grayish and white varieties are found at the same place, also 

 at Cape d'Or and Digby Neck. The usual form is the primary 

 rhombohedron ; the six-sided pyramid occurs rarely at Cape 

 Blomidon. According to Marsh, the variety Gmelinite is 

 found at Blomidon. 



Analcime — Hydrous Silicate of Alumina, Soda, and Lime. Trapezo- 

 hedrons of white and dull reddish colours occur at Blomidon, 

 Two Islands, M'Kay's Head, etc. 



Thomsonite — Hydrous Silicate of Alumina, Lime, and Soda or Potash. 

 I have a small specimen in radiating crystals fi'om the North 

 Mountains of King's County. 



Prehnife — Hydrous Silicate of Alumina, Lime, and Iron. Recorded 

 by Gesner as founrl at Black Rock. I have not seen it. 



ApophylUte — Hydrous Silicate of Lime and Potash is found at a 

 number of places, but in none very plentifully. Green and 

 white crystals, aggregated in plates or in square prisms, occur 

 at Blomidon, Peter's Point, Two Islands, and Cape d'Or. 

 The finest specimens that I have seen are from the latter place, 

 and present rosette-shaped groups of crystals. They were 

 collected by the late Professor Chipman of Acadia College, 

 and are now, I believe, in the museum of that institution. 



Calcareous Spar — Carbonate of Lime is found in fine rhombohedral 

 crystals of white and yellowish colours, and also in the 

 imperfect scalenohedrons known as Dogtooth spar, at Partridge 

 Island, Black Rock, Two Islands, etc. 



To the above list I may add Faroelite, a mineral allied to Scolecite, 

 discovered by Prof. How at Port George, and mentioned by Marsh 

 as occurring at Cape d'Or and Blomidon.* Prof. How has also 

 noticed GyroUte as occurring in Apophyllite near Cape Bloniidon,-]- 

 and has described Centrallasite, Cerinite, Cyanolite, and Mordenite^ 

 from the Trap of Nova Scotia.| 



* Silliman's Journal, N. S., xxvi. p. 31, and vol. xxxv. p. 215. 



f Ibid., vol. xxxii. 



X Ed. riiil. Journal, x. 84, (ju. Journ. Chem. Soc, ISGi. 



